I think Cedar wood has antimicrobial/antibacterial qualities that mean insects and molds, etc don’t like eating/digging into it. I believe is is related to the wood resin. This is why it stands up well in the weather. But I can confirm that bees have no issue living in a hive made from it. I wax dip my pine hives in bees wax and gum rosin: the gum rosin is made from tree sap- and also has antibacterial properties that help preserve wood.
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